The W-band millimeter wave radiometer has been successfully developed under the support of 863-2 projects. The operating frequency is 90.5 GHz and the bandwidth is 2 GHz. The sensitivity of the system is 0.6K and the integration time is 200 ms. The linearity is better than 0.999. The technical index attains the goal to be used in space. Two sets of antenna system have been studied in order to accomplish the work of scanning and imaging. One is Cassegrain and another is binary optical antenna. The principle of the binary optical antenna is optical diffraction. This kind of antenna has some advantages: flexible design, easily to be processed,small volume, light weight, low sidelobe and easily to be assembled. The scanning and imaging experiments of the W-band microwave radiometer have been done in the laboratory and successfully got some images.
Decision tree classification algorithms have significant potential for remote sensing data classification.In this paper, three different types decision tree classification (UDT, MDT and HDT)are presented. First, the paper discussed the algorithms structure and the algorithms theory of decision tree. Second, decision tree algorithms were used to make land cover classification from remotely sensed data, and the results were compared with conventional statistics classification. The results of this research showed that decision trees have several advantages for remote sensing applications by virtue of their relatively simple, explicit, and intuitive classification
structure. In addition, decision tree algorithms are strictly nonparametric and, therefore, without assumptions
regarding the distribution of input data the methods are flexible and robust with respect to general classifications
among input features and class labels.
In this paper the relation of the reflected spectrum and biologic parameter of paddy is analysised, and with it a method of research on the growth status of paddy using TM remote sensing image is put forward. Xiajiadian town of Jilin province is the researchful section. We analysis the growth status of paddy in 2000 and 2001 using the“NDVI”and“LAI”. The result suggests that there is a strong relation between LAI and biomass of paddy, and a strong relation between NDVI and LAI on spectrum. So we can use TM remote sensing image to inspect the growth status of paddy through the relation of NDVI, LAI and biomass.
The weather satellite has more advantages on detecting fog dissipation than that of other general techniques, such as human observation from the surface. In this paper, the main theory of fog dissipation is set forth in short and the characters of fog dissipation are discussed. And some examples are introduced to illustrate these characters and rules from series of GMS-5 satellite images. The results given in this paper includes that the dissipation rate of fog in a certain site is correlated closely with the thickness of fog there, the relative site in the fog area, weather conditions and other impacts of human. Though this study is preparatory and the conclusion is limited, these results will be helpful to the future research and supply references for monitoring fog dissipation by using images from GMS-5 weather satellite.
Ecological vegetation features were studied using remote sensing and geographic information system
technology in Nanjing city and methods of research were discussed. In order to derive proper vegetation infor-
mation from TM image data, several means were tried in this study. Among them, the NDVI band was tested
with other bands and the result showed it was useful for lessening affection of hypsography of mountains on re-
motely sensed image data. The study showed that distribution state of vegetation in Nanjing city is extremely
un-even. Woodland of Zijin Mountain accounts for principal part of the total ecological vegetation. But the area
of ecological vegetation in flourishing central city is especially lacking comparatively. Spatial information tech-
nology, such as remote sensing and geographic information system, is effective in planning and extensive study-
ing ecological vegetation in city in order to provide scientific suggestion for improving ecological environment.
Based on the study, rational advice was brought forward for vegetation planning and construction in Nanjing
city.
Jiangsu province is a big marine province. But the development of marine economy is slow. This doesn' t accord with the region advantages of Jiangsu. To make Jiangsu marine economy develop fast, persistently, steadily and harmoniously, intensifying marine resources survey is an important precondition. This paper presents the advantages of remote sensing and geographic information system in Jiangsu marine resources survey, brings forward the mode of Jiangsu marine resources survey, and brings them into practice of dynamic survey of Jiangsu sea wall and foreshore, analyzing the erosion and sedimentation of port, dock and sea-route,surveying of land-use/land-cover. Combine qualitative survey and quantitative analysis, which not only improve the science and accuracy of Jiangsu marine resources survey but also provide timing and accurate bases for administrant departments concerned to realize layout and management.
Satellite remote sensing has become one of the important tools to detect and monitor red tide events in
coastal areas. This paper reviews the recent progress on satellite remote sensing techniques applicable to red tide
detection and monitoring. The algorithms and methods developed to detect and monitor red tides are presented.
Examples of red tide detection and monitoring using NOAA AVHRR and SeaStar Sea WiFS imagery in China
are also illustrated. Future technique development and their applications are discussed.
With the extension of satellite image with high space resolution from military application to the civil use the remote sensing application has taken a new aspect. Especially, in the field of urban GIS, administrative management, goods transport and evnironment monitoring there are excellant results. In this article briefly are introduced the product of Russian satellite image with high space resolution, functions of image processing software and examples of its application.
IKONOS image provides the 1m high spatial pan and the 4 m multi-spectral data, which can be
merged to improve the class accuracy of visual or computer interpretation. The fusion techniques have been de-
veloped quickly in recent years, an important remote sensing research topic. The fusion algorithms which are
often used in remote sensing includes the IHS transformation, principal component transformation, Brovey
transformation, wavelet transformation and the synthetic variable ratio modified recently. But it has less work
on the evaluation of the quality of the different methods. This paper compares the different merging methods
from the spectral quality and the spatial quality in order to choose the suitable method for the IKONOS image.
From the view of character transform and computer classification, the synthetic variable ratio is the best tech-
nique which distort the spectral quality more slightly and combine the high spatial information better at the same
time.
Ways to analyze the remote sensing image precision of the civil satellite IKONOS, which resolution is
the highest up to now, are presented. So does the derived result. On the basis of the mentioned above, the six
image rectification methods including Helmert, Projective and Affine with different orders are introduced and
the residential errors are analyzed. The result of calculation indicates that the resolution of IKONOS remote
sensing image is about 1.000±0.010 m. It also makes clear that the Affine is the best method of rectification
for IKONOS remote sensing image. The images after being rectified can be used directly to map the relief map
scaled by 1∶10 000.
Drawing from current research and development of image technique, the structure of image information system and the concept of image database were explained here. The main researching parts of image database was pointed out that included memory format of image, image handling under different memort formats and image querying. By describing the concept of QBIC system, with a real system experiment, the main contents of QBIC techniques are expounded, including querying types, characters of image and choosing of distance functions, processing steps of the system are given finally. We present the applying foreground of this technique with the developing image of database in ocean remote sensing.
